Notes: 1. Please do not deep dive with or shower touch hot water with your wristband. 2. The smart band is not for medical use, just for reference only. 3. The system menu language supports English only. Specifications: Model: M4 BT Version: 4.0 Color: Black, Red, Blue (Optional) Waterproof Class: IP67 Compatible System: Android 5.0 above, iOS 9.0 above Battery Capacity: 90mAh lithium battery Screen Size: 0.96TFT Standby Time: About 10 days Working Time: About 7 days Package Size: 12.9 * 7.5 * 2.9cm / 5.08 * 2.95 * 1.14in Package Weight: 40.7g / 1.44oz Package List: 1 * Smart Bracelet 1 * USB Charging Cable 1 * User Manual (Chinese / English)